STMicroelectronics STM32L051K8T6

Overview

STM32L051K8T6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP32 package, featuring 64 KB Flash with ECC, 8 KB SRAM, 2 KB EEPROM, 12-bit ADC (1.14 Msps), and dual ultra-low-power comparators. It operates from 1.65–3.6 V across –40 to +125 °C and delivers 0.4 µA Stop mode current with 16 wakeup lines-ideal for battery-powered IoT sensor nodes requiring long-term autonomous operation.

For engineers reviewing the STM32L051K8T6 datasheet, STM32L051K8T6 pinout, STM32L051K8T6 application, or STM32L051K8T6 equivalent, key selection criteria include verified low-power mode timing (3.5 µs wakeup from RAM), 45 I/Os with 5V tolerance, integrated RTC + backup registers, and pre-programmed USART/SPI bootloader support for field firmware updates.

Technical Context

The STM32L051K8T6 implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), running at up to 32 MHz using multiple clock sources: HSI16 (±1%), LSE (32 kHz RTC), MSI (65 kHz–4.2 MHz), and PLL. Its interconnect matrix routes peripherals-including two USARTs, one LPUART, four SPIs, two I²Cs, and seven timers-to the CPU without bus contention.

Power architecture integrates ultra-low-power BOR with five threshold levels, programmable voltage detector (PVD), and dynamic voltage scaling enabling three operating ranges (1.65–3.6 V). Low-power modes are hardware-orchestrated: Standby (0.27 µA), Stop (0.4 µA), and Stop+RTC+RAM retention (0.8 µA), all supporting configurable wakeup sources including GPIOs, comparators, and RTC alarms.

Key Specifications

Pinout & Package

LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 32-pin quad flat leaded outline, RoHS-compliant and ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L071K8T6, the STM32L051K8T6 trades USB and memory headroom for lower BOM cost and identical ultra-low-power performance; versus EFM32HG322F64G, it delivers proven EEPROM reliability and tighter low-power mode specifications critical for decade-long deployments.

Availability

STM32L051K8T6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, industrial predictive maintenance systems, and medical wearable patches requiring stable component supply across extended product lifecycles.

Supply support for STM32L051K8T6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, MEMS, and automotive semiconductors since 1987.

The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust security features, and seamless integration with ST's ecosystem of development tools and middleware stacks.

FAQ

What is the maximum operating frequency and core type of the STM32L051K8T6?

The STM32L051K8T6 uses an Arm Cortex-M0+ core with a maximum CPU frequency of 32 MHz. This is achieved using the internal 16 MHz HSI oscillator with PLL multiplication or external crystal sources up to 25 MHz. The core includes a Memory Protection Unit (MPU) and delivers 0.95 DMIPS/MHz, validated across the full –40 to +125 °C temperature range and 1.65–3.6 V supply.

Does the STM32L051K8T6 support hardware encryption or secure boot?

No, the STM32L051K8T6 does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It relies on software-based encryption libraries and external secure elements for advanced security. However, it supports readout protection (RDP) Level 1 and 2, option byte write protection, and unique 96-bit ID for device authentication in basic security implementations.

Can the STM32L051K8T6 operate from a 1.8 V supply while maintaining full peripheral functionality?

Yes, at 1.8 V supply the STM32L051K8T6 maintains full functionality of its core, memories, ADC (down to 1.65 V), comparators, timers, and communication interfaces (USART, SPI, I²C), as confirmed in Section 6.3.1 of DS10184 Rev 10. All 45 I/Os remain 5V-tolerant, and low-power modes retain specified current values (e.g., 0.4 µA Stop mode).

What debug interface does the STM32L051K8T6 support, and what pins are required?

The STM32L051K8T6 supports Serial Wire Debug (SW-DP) using two dedicated pins: SWCLK (PA14) and SWDIO (PA13). No reset pin is required for basic debug operations. This single-wire interface enables full JTAG-equivalent debugging - including breakpoints, memory access, and real-time variable inspection - using ST-LINK/V2 or compatible probes.